Jambo frame enable on nexus 5548up.

[fozlarabbi]

Need to jambu frame enable some port on nexus 5548up. But this device is live so I need to know what would be service impact on another port.  

Please help me.

[Rajeshkumar Gatti]

If this 5k is in a VPC and runnign a very old code say 5.0.2 and below then it could be disruptive.

If in VPC and runnign later release then its non disruptive.

In in a non vpc setup then its non disruptive in any code.

How to configure jumbo frame is listed below

http://www.cisco.com/c/en/us/support/docs/switches/nexus-5000-series-switches/112080-config-mtu-nexus.html

-Raj

[Ganesh Hariharan]

Hello,

Jumbo frame enablement is applied globally on Nexus 5k not for specific port by port. 

Apply the below configuration on N5k and you can enable Jumbo frame.

switch(config)#policy-map type network-qos jumbo
switch(config-pmap-nq)#class type network-qos class-default
switch(config-pmap-c-nq)#mtu 9216
switch(config-pmap-c-nq)#exit
switch(config-pmap-nq)#exit
switch(config)#system qos
switch(config-sys-qos)#service-policy type network-qos jumbo

Then you can verify by issuing the below command

show queuing interface ethernet 1/11

Hope it Helps..

-GI

[fozlarabbi]

Thank for your information.

If we have enable jambu frame globally then what would be impact another port.

Because we have need to change mtu value some specific port.

Please help me.  

[Rajeshkumar Gatti]

One you enable jumbo MTU globally, all ports will be capable of handling packet sizes upto 9216.  is there a specfic reason on why would you want to change the MTU per port?

[vmiller]

There would be no impact. configuring ports to handle jumbo frames just means the capability exists. If the app does not create jumbos then things stay the same.